Hi all, familiar with ceph but out of touch on cephfs specifics, so some
quick questions:
- cephfs requires a MDS for its metadata (file/dir structures,
attributes etc?
- Its Active/Passive, i.e only one MDS can be active at a time, with a
number of backup passive MDS's
- The passive MDS's, are they atomically up to date with the active MDS?
no lag?
- How robust is the HA? if there a catastrophic failure on the active
MDS (e.g power off) would active I/O on the cephfs be interupted? any
risk of data or meta data loss? (excluding async transactions).
- Could the MDS db be corrupted by the above?
I guess some of the answers can only be subjective, but I'm looking for
real world experiences. I have been stress testing other systems with
similar architectures and been less than impressed by the results.
Corruptions of every file with active I/Ois not a good outcome :( Use
case is hosting VM's.
thanks,
--
Lindsay Mathieson
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